I've been lifting according to the RTS principles for over 1,5 years where each training day consists of at least 1 upper and 1 lower body exercise. Because my recovery (age, work, kids) is not getting any better (43 yrs), I'm thinking of switching to a personalized upper/lower version of RTS as listed in the manual.

-Why is paused bench press after bench press? The comp. lifts should be prioritized.
-Why not do t&g bench before slingshot bench? By the way, I don't think the pause makes any difference at all with the slingshot.
-Why only 2 pressing exercises on day 4?

Since you are a raw lifter, the standard template for upper body days should look more like this: (you have the right idea for lower body)

You could also do rows/chin ups and any other GPP work (abs, conditioning) on an off day.
I don't think that doing 8 reps on squat and bench is necessarily a good idea, personally I never go over 5 and Mike has people doing up to 6. Too many reps can lead to bad technique and don't carry over as much to strength. If you want to do sets of 7-8 it's better to keep that for supplemental lifts (the last lift of the day in your case).